He had planned to leave the details of health-care reform to Congress, as long as they met his broad goals for a plan that would "lower costs, improve quality and coverage, and also protect consumer choice."

"The president and many others believe that the availability of a public option alongside private options for people who need health care is, is a positive thing," presidential adviser David Axelrod told CBS. "He is going to promote that as part of his plan."

ABC News has learned that Sen. Edward Kennedy, D-Mass., who has vowed to make health care "the cause of my life," has drafted a plan that would require employers to insure their workers. A Kennedy aide cautioned that was a "draft of a draft" and could be changed.

Republicans -- left out of the administration's planning -- have already drawn battle lines.

Republican Senate leader Mitch McConnell, R-Ky, has taken to the Senate floor all week, repeatedly lambasting what he calls a "government takeover of health care."

Republican Sen. Chuck Grassley on Sunday sent this angry message via Twitter: "pres obama you got nerve while u sightseeing in paris to tell us 'time to deliver' on health care."

Obama Enlists Network of Organizers

This weekend the White House enlisted Obama's old campaign network, now Organizing for America, organizing thousands of health-care reform parties from Boston to Los Angeles.

"As folks talk to their neighbors, they're going to go out and talk to their congressmen and create this urgent reform this year," Hari Sevugan, a Democratic National Committee spokesman who also works with Organizing for America, told ABC News.

The health care crisis that drove supporters into Obama's campaign last year is now driving them by the thousands into health-care parties. What is less clear is whether when they walk out they will be able to make a difference.

Hundreds of thousands participated in a similar campaign to boost the president's budget and stimulus plans, but that remains a far cry from the 13 million Americans on his campaign list.

A few attendees at gatherings in Chevy Chase, Md., and Washington, D.C., expressed skepticism about the administration's plans.

"Before we can go out and beat the drums for an Obama health initiative, we have to know what it is," one meeting attendee said.

Democratic organizers say the movement is growing, and leaders have learned from past efforts to rally supporters for the president's budget and economic stimulus plans.

"There are tens of thousands of Americans gathered in libraries, in their living rooms -- instead of staying outside -- talking about reforming the health-care system," Sevugan said. "I think that is a great success."